How to upgrade my fork to more than 100mm
you sure can. You just need to get one that has the same size diameter steering tube as the one you currently have. You will need some special tools to remove the headset races that are pressed on to the fork and then you can move them to the new fork.
As far as "upgrading" to a longer travel fork, take into consideration that when you do this, you will change the geometry of the bike, effectively "slackening" the head tube angle and they will dramatically affect the steering of the bicycle, it will turn very "sluggishly" and feel like it flops from side to side almost.
Not a big deal if you are on the street, but in a technical offroad situation, this can be a problem if you are not used to the new handling dynamics.
Bicycle frames are literally built around the forks for their handling characteristics. But you say, "I see this done on motorcycles all the time." Yes this is true, but the devil is in the details. On motorcycles a "triple-tree" crown is used and typically the lower tree is machined with the proper offset factored in so that longer forks can be used without lifting the frame and affecting the handling. The one major factor that determines the handling characteristics of two wheeled travel is the measure of the front wheel's "trail". Google it and you will find volumes of information on it and how it is measured. For bicycles there is a "sweet spot" of trail measurement, most manufacturers keep this as a proprietary secret. Before you actually swap out the forks, you can calculate how the longer forks you plan on installing on your bike will affect the trail measurement on your bike to determine if you want to ride the bike this way, before you spend the money. Only you can decide if it is better to save up the money to buy a longer travel bike with the correct geometry or not.
good luck and wear a helmet. More suspension travel just allows you to ride faster off road, so you might be going OTB (over the bars) with the new, longer travel, option. :-)
May 01, 2014 |